We have one hen that is getting all her feathers plucked out of her back just above tail and up half her back. they have picked them clean out of her skin and continue to do so. we have others that have many of their rear feathers under tail and down plucked out. We got a rooster a couple weeks ago and does not seem be helping much. what can we do to stop this before we end up with a flock of featherless hens???